The term Bad bloông xã is no stranger khổng lồ us, but not everyone knows what a Bad blochồng is? So khổng lồ find out what is Bad block? How khổng lồ check và fix errors on SSDs, please refer khổng lồ the following article of

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What is a Bad bloông chồng error? How to check and fix errors on SSDs

Bad bloông chồng is a multitruyền thông storage area that is no longer reliable for data storage and retrieval because it has been physically damaged or corrupted. In addition, the Bad Block error is also called the error Bad Sector.

There are 2 different types of Bad blocks, of which: Bad blocks due to physical errors are called hard blocks. And the Bad bloông chồng due khổng lồ a software error is also known as a “logical” or “bad” bad blochồng, which occurs when the operating system cannot read data from the sector.

Give an example of a soft bad blochồng that occurs when Cyclic Redundancy Check (CRC) or Error Correction Code (ECC) for a specific storage bloông chồng does not match the data read by the disk. Or bad bloông chồng error (s) encountered on read – continue anyway when conducting Ghost Win.

On HHD hard drives, a bad block may occur when a position on the hard drive is corrupted or corrupted. On USB NAND drives, blocks can become worn out, making them unreliable or unusable after a certain number of write & erase cycles.


The cause of the Bad Bloông xã error

Storage drives that are shipped from the factory may have a manufacturing defect. Before removable devices start the factory, these bad blocks are marked as defective and are mapped in addition to the memory elements of the drive sầu.

Also a bad bloông xã can cause physical damage to lớn a device, leaving the operating system unable lớn access data. On an HHD hard drive sầu, risks such as a máy tính xách tay crash may be a drive sầu failure. Natural dirt & wear can also cause a hard drive sầu to lớn fail.

A damaged SSD hard drive sầu occurs when the memory transistor is broken. Storage elements can also become unreliable over time, as the NAND flash substrate in an element may not be usable after certain program erasing cycles.

The erasing process on an SSD requires sending a large amount of power through the flash element. Over time, this reduces the oxide layer that separates the gate transistors from the flash memory silicon substrate & increases the error rate.

The drive controller can use error detection & correction mechanisms to correct these errors. However, at some point, the errors may exceed the controller’s error correction capabilities and the element may become unreliable.


Bad soft blocks occur due khổng lồ software issues. For example, if the computer suddenly shuts down, the hard drive sầu is turned off during write to the block. In this case, the bloông xã may contain data that does not match its CRC error correction code and is identified as a bad block.

What error does the bad bloông chồng cause?

When a bloông xã is corrupted or corrupted, it can cause an error that makes data stored in it inaccessible. If the operating system or application files stored in the blochồng fail, it may result in the operating system or application not being able to lớn run. If the number of bad blocks increases, it will take up system space and không lấy phí space, leading to reduced disk performance and hardware failure.

Some software utilities such as CHKDSK on Microsoft Windows operating systems or badbloông chồng on Linux can scan the hard drive và mark faulty sectors that the operating system cannot use.

In addition, the firmware on the HDD controller can identify and mark a bad blochồng as unusable. This usually happens when a bliông xã is overwritten with new data. The controller automatically maps the bad block lớn another sector. Once identified as bad, the sector will not be used for future activities. Bad blocks are identified during post-production testing of drives listed on the P-List, which is either the permanent error các mục or the main error danh sách. Bad blocks are found after the drive sầu is used, causing physical damage or reducing the writing surface, which is recorded in the G-List, which stands for growing danh mục.

When the NAND USB flash drive sầu identifies a bad blochồng, it will be written in the Bad Bloông chồng Table (BBT) of the device. Before reading or writing to the NAND device, the controller will kiểm tra the BBT of the device to avoid bad blocks. The flash drive sầu uses two types of BBT: the resident NAND type is retained on the boot system and the resident BBT RAM is regenerated every time the system boots.

Bad bloông xã management

The best way to fix a HDD file affected by bad bloông xã is lớn overwrite the original file. This will cause an error that causes the hard drive khổng lồ maps bad blocks or correct CRC or data.

Bad bloông chồng management khổng lồ improve the reliability and durability of NAND drives. Unlượt thích magnetic storage truyền thông media, flash drives cannot be overwritten at the byte màn chơi, all changes must be written khổng lồ a new blochồng và data in the original bloông chồng must be marked for deletion.

After the flash drive is full, the controller will start deleting blocks marked for deletion before it can overwrite new data. To bởi this, it will consolidate the good data by copying the data into lớn a new bloông chồng.

This process requires additional recording khổng lồ consolidate the data well và as a result expands write amplification, ie the actual number of writes exceeds the number of writes required. Write amplification can reduce flash drive performance and life.

Flash drive sầu manufacturers use different techniques to lớn control write amplification. The first technique is the garbage collection (or garbage collection process), which involves actively consolidating data by releasing previously overridden blocks. Once completed properly, the reallocated sectors can reduce the need to delete the entire data blochồng for each write operation.

Manufacturers also use data-reduction technologies, such as compression & copying, lớn minimize the amount of data written and deleted on the drive.

Besides, the SSD interface can help reduce write amplification. ATA and SAS’s UNIMAPhường SSD TRIM commands identify blocks of data that are no longer in use & can be erased. This approach minimizes garbage collection & frees up disk space, resulting in better performance.

To extover the life of SSDs, the controller software that manages NAND devices can implement wear-leveling algorithms to distribute the P-E cycles. drives và make sure no blocks are overused compared khổng lồ others. With the màn chơi of attrition, the flash device will bản đồ the storage drives when the recording process occurs. This approach ensures that write cycles are spread evenly across all memory components và no blocks are written more, limiting errors on the bloông chồng.

To tư vấn activities lượt thích balancing wear & the garbage collection process, manufacturers add storage hardware that is added khổng lồ the drive sầu but is not visible on the user’s computer – overprovision. In this way, the drive has a built-in storage element to lớn aid writing, improve drive performance, and replace worn out elements.

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Currently there are many best hard drive sầu bad sector repair software such as HDD Regenerator or Hard Disk Sentinel, if you vày not specialize in these errors, please refer khổng lồ the article on how lớn fix bad bloông chồng errors on So the article above sầu has just answered to lớn you the question of what is a bad block? How to lớn kiểm tra, fix errors, fix a bad hard drive on an SSD or fix a bad sector SSD. Hopefully the above article has provided you with useful information about what a bad blochồng is. In addition, if you have sầu any questions or questions, you can leave sầu your comments in the bình luận section below the article.